Method and theory of monophasic action potential recording
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Optical mapping of cardiac electromechanics in beating in vivo hearts
2023, Biophysical JournalNoise enhanced the electrical stimulation-contractile response coupling in isolated mouse heart
2016, International Journal of CardiologyCitation Excerpt :Second, contraction force (CF), since the force is measured through a suture and a force-transducer placed at the apex of the heart and the heart is composed of several layers of muscle fibers oriented in different directions, and then an approximate measurement of the force of muscular contraction was obtained [15]. To obtain these two variables, an electrical stimulation was applied to the right atrium, in order to induce a depolarization followed by the action potential and a contraction [16]. To the best of our knowledge, this is the first experimental test in whole heart focused on analyzing the contractile response due to electrical stimulation perturbed with Gaussian white noise.
Shortening of intraventricular conduction time with rapid ventricular pacing
2014, Journal of ArrhythmiaCitation Excerpt :MAP signals were amplified at a filter setting of 0.05–500 Hz. Ventricular pacing was performed from the proximal electrode pair of the Franz catheter at twice diastolic threshold strength and a pulse duration of 2 ms. The MAP duration (MAPD) was measured as the interval along a line horizontal to the diastolic baseline, from the steepest part of the MAP upstroke to the level of 90% repolarization (MAPD90) [9]. The right ventricle (RV) was paced at cycle lengths (CLs) of 600, 500, 400, 350, 300, 275, and 250 ms for 120 beats at each CL.
Developing a novel comprehensive framework for the investigation of cellular and whole heart electrophysiology in the in situ human heart: Historical perspectives, current progress and future prospects
2014, Progress in Biophysics and Molecular BiologyCitation Excerpt :Early MAP recordings during cardiac catheterisation procedures were made with a catheter that employed suction onto the endocardium (Olsson et al., 1971). Subsequently most MAP recordings have been obtained using the Franz contact electrode concept in a bipolar configuration (Franz, 1983, 1991; Franz et al., 1986; Moore and Franz, 2007). One Ag–AgCl electrode is in contact with myocardium which is partially depolarised as a result of the pressure contact and a second Ag–AgCl electrode is in contact with the adjacent non depolarised tissue (see Fig. 1).
Monophasic action potential duration alternans after abrupt shortening of the cardiac cycle in humans
2014, Journal of ArrhythmiaCitation Excerpt :Ventricular pacing was performed from the proximal electrode pair of the Franz® catheter at twice the diastolic threshold strength and a 2-ms pulse duration. MAPD was measured as the interval along a line horizontal to the diastolic baseline from the steepest part of the MAP upstroke to the level of 90% repolarization [16]. The right ventricle (RV) was paced at cycle lengths (CLs) of 600, 500, 400, 350, 300, and 275 ms for 120 beats at each CL.